[Elecraft] Sherwood Engineering Tests

[Edward R Cole]

My K3/10 (SN 4043) was purchased on 3/5/2010 (per the invoice).  I'm 
sure that I have the new DSP board and KXV3A. I know that it includes 
the improved gain in the 1st IF.  I have not installed any upgrades 
other than the EXREF and firmware updates.  It has three filters: 
13/2.8/400 in main Rx and 2.8 in sub-Rx (KRX3).  It has KBPF3 and 
KTCXO3-1.  I installed a minor HB modification to bring the sub-Rx IF 
out to a BNC connector.

I do not use the internal speaker that seems a little harsh to me.  I 
am using a very old ten inch National Speaker from the 1950's that 
many might say is "too mellow".  Sound is fine using my SONY stereo 
headset which has wider frequency response than the radio.

Another couple weeks and my K3 will be five years old.

73, Ed - KL7UW

From: Wayne Burdick <n6kr at elecraft.com>
To: George Dubovsky <n4ua.va at gmail.com>
Cc: Elecraft Reflector <elecraft at mailman.qth.net>,      "Wes \(N7WS\)"
         <wes at triconet.org>
Subject: Re: [Elecraft] Sherwood Engineering Tests
Message-ID: <9AAC73A0-9B20-4AE3-ACB9-FB4045B168E6 at elecraft.com>
Content-Type: text/plain; charset=utf-8

Hi George,

I just checked the web site and I see that we've been shipping K3s 
with the new DSP board since sometime in 2010. (Confirming that time flies.)

You can upgrade the DSP board from rev. C to rev. D for $109 
(K3DSPUPGD); this includes both the audio low-pass filter and a bit 
of an improvement in LF audio response. Or you can add just the audio 
filter section as a small daughter board for $39 (K3DSPLPF).

The upgrade does improve the spectra as viewed on an audio spectrum 
analyzer, but many operators won't be able to hear the effects by 
ear. Those who can hear them have told us it was a major improvement.

Wayne
N6KR


73, Ed - KL7UW
http://www.kl7uw.com
     "Kits made by KL7UW"
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